They're really only 100w? And how high can they clock? Both of my HD79x0 cards are just under 1GHz each...

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MSI 7970 is at 1125MHz/1.175v (1.13v real, need a new BIOS), Gigabyte 7950 is at 1200MHz/1.25v+ (1.21v real) default voltage and XFX 7950 is at 1150MHz/1.125v (1.075v real). The only card I have tested with gaming is the XFX, which conveniently has the largest vdroop and poorest VRM design. GPU-Z says my 12v input current is 8-9 amperes for each of the three cards.